<正> 铝-石墨复合材料制造中的突出问题是铝液与石墨的润湿能力很差,为此大多在工艺上采取措施,如石墨表面喷涂Ti-B,Ni或Cu涂层,或采用流变铸造等。然而这些措施使得工艺复杂、成本提高,因而推广应用受到限制。为改善铝液与石墨的润湿能力,有必要深入研究铝液对石墨的润湿过程。国内外这方面报道甚少,而且所报道的结果差别较大。我们通过长时间的保温试验,仔细地研究了不同温度下铝液对石墨的润湿过程,发现了一些新的现象。
The wetting of graphite by liquid aluminium was studied by sessile drop method.The results show that in accordance with the variation of contact angle with time, the wettingprocess may be divided into three dynamic stages: nonwetting, abrupt change and gradual wetting.At the first stage, the contact angle between drop surface covered by aluminium oxide film andgraphite substrate was very large; while at the last stage, the formation of Al_4C_3 at the interfaceof aluminium and graphite led to the decrease of contact angle gradually. The transition pointfrom the second stage to the last one is defined as the "actual contact angle" by the authors,which can be used as an exact indication of wettability. By increasing the temperature, the wet-ting of graphite by liquid aluminium may be improved.
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| [7] | Jackson P W. Met Eng Q, 1969 |
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